CA2735347C - Co2 refrigeration system for ice-playing surface - Google Patents
Co2 refrigeration system for ice-playing surface Download PDFInfo
- Publication number
- CA2735347C CA2735347C CA2735347A CA2735347A CA2735347C CA 2735347 C CA2735347 C CA 2735347C CA 2735347 A CA2735347 A CA 2735347A CA 2735347 A CA2735347 A CA 2735347A CA 2735347 C CA2735347 C CA 2735347C
- Authority
- CA
- Canada
- Prior art keywords
- refrigerant
- condensation
- circuit
- heat
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lubricants (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A CO2 refrigeration system for an ice-playing surface comprises a transfer circuit, a CO2 refrigerant circuit and an independent condensation circuit. A transfer refrigerant circulates in the transfer circuit between a condensation heat exchanger and an evaporation heat exchanger. The CO2 circuit is in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant. The CO2 circuit comprises a condensation reservoir to accumulate the CO2 refrigerant, and an evaporation stage to receive the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface. The independent circuit is in heat-exchange relation with the refrigerant of the transfer circuit at the evaporation heat exchanger. The independent circuit comprises a compression stage with a magnetically operated compressor to compress a secondary refrigerant, a condensation stage in which the secondary refrigerant releases heat, and an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant at the evaporation heat exchanger to absorb heat.
Description
FIELD OF THE APPLICATION
The present application relates to refrigeration systems used to refrigerate ice-playing surfaces such as a skating rinks, curling sheets, etc, and more particularly to refrigeration systems using CO2 refrigerant.
BACKGROUND OF THE ART
With the growing concern for global warming, the use of chlorofluorocarbons (CFCs) and hydrochlorofluoro-io carbons (HCFCs) as refrigerant has been identified as having a negative impact on the environment. These chemicals have non-negligible ozone-depletion potential and/or global-warming potential.
As alternatives to CFCs and HCFCs, ammonia, hydro-carbons and CO2 are used as refrigerants. Although ammonia and hydrocarbons have negligible ozone-depletion potential and global-warming potential as does CO2, these refrigerants are highly flammable and therefore represent a risk to local safety. On the other hand, CO2 is environmentally benign and locally safe.
SUMMARY OF THE APPLICATION
It is therefore an aim of the present disclosure to provide a CO2 refrigeration system for ice-playing surfaces that addresses issues associated with the prior art.
Therefore, in accordance with the present application, there is provided a CO2 refrigeration system for an ice-playing surface, comprising: a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat; a CO2 refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant, the CO2 refrigerant circuit comprising a condensation reservoir accumulating a portion of the CO2 refrigerant in a liquid state and an evaporation stage receiving the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface; and an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant, a condensation stage in which the secondary refrigerant releases heat, and an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a block diagram of a CO2 refrigeration system for ice-playing surface in accordance with an embodiment of the present application.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to the drawings and more particularly to Fig. 1, there is illustrated a CO2 refrigeration system 1 for ice-playing surface.
In Fig. 1, the CO2 refrigeration system 1 has a CO2 evaporation closed circuit 10, in which cycles CO2 refrigerant. The CO2 evaporation circuit 10 comprises a condensation reservoir 12 accumulating CO2 refrigerant in a liquid and gaseous state.
Line 14 directs CO2 refrigerant from the condensation reservoir 12 to an evaporation stage, with a flow of CO2 refrigerant induced by pump and/or an expansion valve(s) as generally indicated as 15. As is shown in Fig. 1, the CO2 refrigerant is then fed to the ice-playing surface evaporation stage 16.
The ice-playing surface evaporation stage 16 of Fig. 1 may consist of a circuit of pipes positioned under the ice-playing surface, in which the CO2 refrigerant circulates to absorb heat from fluid being frozen to form the ice-playing surface, or to maintain the ice-playing surface frozen.
The ice-playing surface evaporation stage 16 of Fig. 1 may also consist of an evaporation exchanger, by which the CO2 refrigerant of the evaporation circuit 10 absorbs heat from a closed circuit of pipes of the ice-playing surface refrigeration stage 16. An alternative refrigerant circulates in the closed circuit of pipes of the ice-playing surface refrigeration stage 16, such as brine, glycol, or the like.
CO2 refrigerant exiting the evaporation stage 16 is directed to the condensation reservoir 12, by way of line 18.
The CO2 evaporation circuit 10 is in a heat-exchange relation with a transfer circuit 20. The transfer circuit 20 is a closed circuit for instance of the type in which a transfer refrigerant (e.g,, alcohol-based such as glycol, water, brine or the like) cycles. A condensation heat exchanger 21 is in fluid communication with the condensation reservoir 12, so as to receive CO2 refrigerant in a gaseous state, whereby the transfer refrigerant absorbs heat from the CO2 refrigerant in the heat exchanger 21.
According to an embodiment, the condensation heat exchanger 21 has a coil that is positioned inside the condensation reservoir 12.
The condensation heat exchanger 20 cycles the transfer refrigerant between the heat exchanger 21 and an evaporation heat exchanger 31 of an independent condensation circuit 30. Although not shown, appropriate flow-inducing devices may be used, such as a pump. Accordingly, the transfer refrigerant absorbs heat from the CO2 refrigerant circulating in the CO2 evaporation circuit 10, and releases the heat to the refrigerant circulating in the condensation circuit 30.
The independent condensation circuit uses the heat exchanger 31 as an evaporation stage. The condensation circuit is closed and comprises a condensation refrigerant that circulates in the heat exchanger 31 so as to absorb heat from the transfer refrigerant.
In the condensation circuit, the condensation refrigerant circulates between the heat exchanger 31 in which the condensation refrigerant absorbs heat, a compression stage 32 in which the condensation refrigerant is compressed, and a condensation stage 33 in which the condensation refrigerant releases heat. The compression stage 32 may use TurbocorTM compressors, or any other appropriate magnetically operated type of compressor. In an example, the condensation stage 33 features heat reclaiming (e.g., using a heat exchanger with a heat-transfer fluid) in parallel or in series with other components of the condensation stage 33, so as to reclaim heat from the CO2 refrigerant.
It is pointed out that the condensation circuit may be used with more than one CO2 refrigeration circuit.
In such a case, the condensation circuit features a plurality of heat exchangers 20, for instance with one for each of the CO2 refrigeration circuits.
Examples of the condensation refrigerant are refrigerants such as R-404 and R-507, amongst numerous examples. It is observed that the condensation circuit may be confined to its own casing as illustrated in Fig. 1.
Moreover, considering that the condensation circuit is preferably limited to absorbing heat from stages on a refrigeration pack (e.g., condensation reservoir 12, suction header in line 18), the condensation circuit does not contain a large volume of refrigerant when compared to the CO2 refrigeration circuit, of a secondary refrigerant circuit defined hereinafter.
The present application relates to refrigeration systems used to refrigerate ice-playing surfaces such as a skating rinks, curling sheets, etc, and more particularly to refrigeration systems using CO2 refrigerant.
BACKGROUND OF THE ART
With the growing concern for global warming, the use of chlorofluorocarbons (CFCs) and hydrochlorofluoro-io carbons (HCFCs) as refrigerant has been identified as having a negative impact on the environment. These chemicals have non-negligible ozone-depletion potential and/or global-warming potential.
As alternatives to CFCs and HCFCs, ammonia, hydro-carbons and CO2 are used as refrigerants. Although ammonia and hydrocarbons have negligible ozone-depletion potential and global-warming potential as does CO2, these refrigerants are highly flammable and therefore represent a risk to local safety. On the other hand, CO2 is environmentally benign and locally safe.
SUMMARY OF THE APPLICATION
It is therefore an aim of the present disclosure to provide a CO2 refrigeration system for ice-playing surfaces that addresses issues associated with the prior art.
Therefore, in accordance with the present application, there is provided a CO2 refrigeration system for an ice-playing surface, comprising: a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat; a CO2 refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant, the CO2 refrigerant circuit comprising a condensation reservoir accumulating a portion of the CO2 refrigerant in a liquid state and an evaporation stage receiving the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface; and an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant, a condensation stage in which the secondary refrigerant releases heat, and an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a block diagram of a CO2 refrigeration system for ice-playing surface in accordance with an embodiment of the present application.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to the drawings and more particularly to Fig. 1, there is illustrated a CO2 refrigeration system 1 for ice-playing surface.
In Fig. 1, the CO2 refrigeration system 1 has a CO2 evaporation closed circuit 10, in which cycles CO2 refrigerant. The CO2 evaporation circuit 10 comprises a condensation reservoir 12 accumulating CO2 refrigerant in a liquid and gaseous state.
Line 14 directs CO2 refrigerant from the condensation reservoir 12 to an evaporation stage, with a flow of CO2 refrigerant induced by pump and/or an expansion valve(s) as generally indicated as 15. As is shown in Fig. 1, the CO2 refrigerant is then fed to the ice-playing surface evaporation stage 16.
The ice-playing surface evaporation stage 16 of Fig. 1 may consist of a circuit of pipes positioned under the ice-playing surface, in which the CO2 refrigerant circulates to absorb heat from fluid being frozen to form the ice-playing surface, or to maintain the ice-playing surface frozen.
The ice-playing surface evaporation stage 16 of Fig. 1 may also consist of an evaporation exchanger, by which the CO2 refrigerant of the evaporation circuit 10 absorbs heat from a closed circuit of pipes of the ice-playing surface refrigeration stage 16. An alternative refrigerant circulates in the closed circuit of pipes of the ice-playing surface refrigeration stage 16, such as brine, glycol, or the like.
CO2 refrigerant exiting the evaporation stage 16 is directed to the condensation reservoir 12, by way of line 18.
The CO2 evaporation circuit 10 is in a heat-exchange relation with a transfer circuit 20. The transfer circuit 20 is a closed circuit for instance of the type in which a transfer refrigerant (e.g,, alcohol-based such as glycol, water, brine or the like) cycles. A condensation heat exchanger 21 is in fluid communication with the condensation reservoir 12, so as to receive CO2 refrigerant in a gaseous state, whereby the transfer refrigerant absorbs heat from the CO2 refrigerant in the heat exchanger 21.
According to an embodiment, the condensation heat exchanger 21 has a coil that is positioned inside the condensation reservoir 12.
The condensation heat exchanger 20 cycles the transfer refrigerant between the heat exchanger 21 and an evaporation heat exchanger 31 of an independent condensation circuit 30. Although not shown, appropriate flow-inducing devices may be used, such as a pump. Accordingly, the transfer refrigerant absorbs heat from the CO2 refrigerant circulating in the CO2 evaporation circuit 10, and releases the heat to the refrigerant circulating in the condensation circuit 30.
The independent condensation circuit uses the heat exchanger 31 as an evaporation stage. The condensation circuit is closed and comprises a condensation refrigerant that circulates in the heat exchanger 31 so as to absorb heat from the transfer refrigerant.
In the condensation circuit, the condensation refrigerant circulates between the heat exchanger 31 in which the condensation refrigerant absorbs heat, a compression stage 32 in which the condensation refrigerant is compressed, and a condensation stage 33 in which the condensation refrigerant releases heat. The compression stage 32 may use TurbocorTM compressors, or any other appropriate magnetically operated type of compressor. In an example, the condensation stage 33 features heat reclaiming (e.g., using a heat exchanger with a heat-transfer fluid) in parallel or in series with other components of the condensation stage 33, so as to reclaim heat from the CO2 refrigerant.
It is pointed out that the condensation circuit may be used with more than one CO2 refrigeration circuit.
In such a case, the condensation circuit features a plurality of heat exchangers 20, for instance with one for each of the CO2 refrigeration circuits.
Examples of the condensation refrigerant are refrigerants such as R-404 and R-507, amongst numerous examples. It is observed that the condensation circuit may be confined to its own casing as illustrated in Fig. 1.
Moreover, considering that the condensation circuit is preferably limited to absorbing heat from stages on a refrigeration pack (e.g., condensation reservoir 12, suction header in line 18), the condensation circuit does not contain a large volume of refrigerant when compared to the CO2 refrigeration circuit, of a secondary refrigerant circuit defined hereinafter.
Although not fully illustrated, numerous valves are provided to control the operation of the CO2 refrigeration system 1 as described above. Moreover, a controller ensures that the various stages of the refrigeration system 1 operate as described, for instance by having a plurality of sensors placed throughout the refrigeration system 1. Numerous other components may be added to the refrigeration system 1 (e.g., valves, tanks, pumps, compressors, pressure-relief systems, etc.), to support the configurations illustrated in Fig. 1.
It is within the ambit of the present invention to cover any obvious modifications of the embodiments described herein, provided such modifications fall within the scope of the appended claims.
It is within the ambit of the present invention to cover any obvious modifications of the embodiments described herein, provided such modifications fall within the scope of the appended claims.
Claims (6)
1. A CO2 refrigeration system for an ice-playing surface, comprising:
a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat;
a CO2 refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant, the CO2 refrigerant circuit comprising:
a condensation reservoir accumulating a portion of the CO2 refrigerant in a liquid state;
an evaporation stage receiving the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface;
an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising:
a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant;
a condensation stage in which the secondary refrigerant releases heat; and an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom.
a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat;
a CO2 refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant, the CO2 refrigerant circuit comprising:
a condensation reservoir accumulating a portion of the CO2 refrigerant in a liquid state;
an evaporation stage receiving the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface;
an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising:
a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant;
a condensation stage in which the secondary refrigerant releases heat; and an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom.
2. The CO2 refrigeration system according to claim 1, further comprising a line extending from a top of the condensation reservoir to the heat exchanger, such that gaseous CO2 refrigerant in the condensation reservoir is directed to the independent condensation circuit.
3. The CO2 refrigeration system according to claim 1, wherein the condensation heat exchanger is positioned in a line extending from the condensation reservoir to the evaporation stage.
4. The CO2 refrigeration system according to claim 1, wherein the condensation heat exchanger is a coil inside the condensation reservoir.
5. The CO2 refrigeration system according to any one of claims 1 to 4, wherein the evaporation stage has a circuit of pipes arranged under the ice-playing surface, whereby the CO2 refrigerant circulating in the circuit of pipes of the evaporation stage absorbs heat from the ice-playing surface.
6. The CO2 refrigeration system according to any one of claims 1 to 4, wherein the evaporation stage has a heat exchanger for the heat exchange between the CO2 refrigerant and another refrigerant circulating in a circuit of pipes arranged under the ice-playing surface, whereby the other refrigerant circulating in the circuit of pipes of the evaporation stage absorbs heat from the ice-playing surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2735347A CA2735347C (en) | 2011-03-28 | 2011-03-28 | Co2 refrigeration system for ice-playing surface |
| US13/427,007 US20120247148A1 (en) | 2011-03-28 | 2012-03-22 | Co2 refrigeration system for ice-playing surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2735347A CA2735347C (en) | 2011-03-28 | 2011-03-28 | Co2 refrigeration system for ice-playing surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2735347A1 CA2735347A1 (en) | 2011-06-13 |
| CA2735347C true CA2735347C (en) | 2011-10-11 |
Family
ID=44166569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2735347A Expired - Fee Related CA2735347C (en) | 2011-03-28 | 2011-03-28 | Co2 refrigeration system for ice-playing surface |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20120247148A1 (en) |
| CA (1) | CA2735347C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8966934B2 (en) | 2011-06-16 | 2015-03-03 | Hill Phoenix, Inc. | Refrigeration system |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9995509B2 (en) * | 2013-03-15 | 2018-06-12 | Trane International Inc. | Cascading heat recovery using a cooling unit as a source |
| CA2815783C (en) | 2013-04-05 | 2014-11-18 | Marc-Andre Lesmerises | Co2 cooling system and method for operating same |
| NZ714420A (en) | 2013-05-03 | 2018-11-30 | Hill Phoenix Inc | Systems and methods for pressure control in a co2 refrigeration system |
| US11656005B2 (en) | 2015-04-29 | 2023-05-23 | Gestion Marc-André Lesmerises Inc. | CO2 cooling system and method for operating same |
| US11125483B2 (en) | 2016-06-21 | 2021-09-21 | Hill Phoenix, Inc. | Refrigeration system with condenser temperature differential setpoint control |
| US11796227B2 (en) | 2018-05-24 | 2023-10-24 | Hill Phoenix, Inc. | Refrigeration system with oil control system |
| US11397032B2 (en) | 2018-06-05 | 2022-07-26 | Hill Phoenix, Inc. | CO2 refrigeration system with magnetic refrigeration system cooling |
| US10663201B2 (en) | 2018-10-23 | 2020-05-26 | Hill Phoenix, Inc. | CO2 refrigeration system with supercritical subcooling control |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2680956A (en) * | 1951-12-19 | 1954-06-15 | Haskris Co | Plural stage refrigeration system |
| US3392541A (en) * | 1967-02-06 | 1968-07-16 | Larkin Coils Inc | Plural compressor reverse cycle refrigeration or heat pump system |
| US3733845A (en) * | 1972-01-19 | 1973-05-22 | D Lieberman | Cascaded multicircuit,multirefrigerant refrigeration system |
| AU606898B2 (en) * | 1987-10-30 | 1991-02-21 | Takenaka Corporation | Air-conditioner using regenerative cooling cycle |
| US6321551B1 (en) * | 1999-05-21 | 2001-11-27 | Thomas J. Backman | Series secondary cooling and dehumidification system for indoor ice rink facilities |
| JP2004510944A (en) * | 2000-10-05 | 2004-04-08 | オペロン・カンパニー・リミテッド | Cryogenic refrigeration system |
| US7065979B2 (en) * | 2002-10-30 | 2006-06-27 | Delaware Capital Formation, Inc. | Refrigeration system |
| JP5452845B2 (en) * | 2004-01-28 | 2014-03-26 | ブルックス オートメーション インコーポレイテッド | Refrigerant cycle using mixed inert component refrigerant |
| US7363772B2 (en) * | 2004-08-18 | 2008-04-29 | Ice Energy, Inc. | Thermal energy storage and cooling system with secondary refrigerant isolation |
| US7421846B2 (en) * | 2004-08-18 | 2008-09-09 | Ice Energy, Inc. | Thermal energy storage and cooling system with gravity fed secondary refrigerant isolation |
| DK1974169T3 (en) * | 2006-01-20 | 2013-04-02 | Carrier Corp | Process for controlling the temperature in several chambers in connection with a refrigerated transport |
| US20090120117A1 (en) * | 2007-11-13 | 2009-05-14 | Dover Systems, Inc. | Refrigeration system |
| US8166773B2 (en) * | 2008-10-08 | 2012-05-01 | Venturedyne, Ltd. | Refrigeration capacity banking for thermal cycling |
| US8789380B2 (en) * | 2009-07-20 | 2014-07-29 | Systemes Lmp Inc. | Defrost system and method for a subcritical cascade R-744 refrigeration system |
-
2011
- 2011-03-28 CA CA2735347A patent/CA2735347C/en not_active Expired - Fee Related
-
2012
- 2012-03-22 US US13/427,007 patent/US20120247148A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8966934B2 (en) | 2011-06-16 | 2015-03-03 | Hill Phoenix, Inc. | Refrigeration system |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120247148A1 (en) | 2012-10-04 |
| CA2735347A1 (en) | 2011-06-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20190328 |